Peter Ritmeester Books

Will Shortz Presents Stress-Buster Sudoku: 100 Wordless Crossword Puzzles

By Will Shortz, Will, Peter Ritmeester, Shortz

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Features 100 easy sudoku. This work contains big grids with lots of space for easy solving.

Will Shortz Presents Get Smart Sudoku: 100 Easy-To-Hard Puzzles

By Will Shortz, Will, Peter Ritmeester, Shortz

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Sudoku has taken America by storm! Puzzled by the wordless crossword puzzle? Try one or two of these simple, easy-to-solve sudoku and you'll discover what millions of fans already know: There's not...

Will Shortz Presents Sudoku In A Snap: 100 Simple Wordless Crossword Puzzles

By Will Shortz, Peter Ritmeester

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Gek Op Sudoku 4

By Peter Ritmeester

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Sixy Sudoku Wacky ●●●●

By Peter Ritmeester

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Sixy Sudoku Wacky

By Peter Ritmeester

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Sixy Sudoku ●●

By Peter Ritmeester

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Sixy Sudoku Wacky ●

By Peter Ritmeester

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Sixy Sudoku Wacky ●●

By Peter Ritmeester

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Hyper Sudoku ●

By Peter Ritmeester

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.